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Carter: Digital Radiography and PACS - page 4 / 6

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TOP:DQE - detective quantum efficiency

16.Digital imaging systems have ______.

a.

Narrower DQE latitude than screen/film systems

b.

Wider DQE latitude than screen/film systems

c.

The same DQE latitude as screen/film systems

d.

No DQE latitude

ANS:B

OBJ:Compare detector detective quantum efficiency to cassette-based systems.

TOP:DQE - detective quantum efficiency

17.Which of the following have the greatest DQE?

a.

Film/screen systems

b.

Cassette-based radiography

c.

Cassetteless radiography

d.

All have the same DQE.

ANS:C

OBJ:Compare detector detective quantum efficiency to cassette-based systems.

TOP:DQE - detective quantum efficiency

18.The smaller the area of the TFT photodiodes, the less radiation can be detected.

a.

True

b.

False

ANS:B

OBJ:Compare detector detective quantum efficiency to cassette-based systems.

TOP:DQE - detective quantum efficiency

19.The DQE of detectors changes with changes in ______.

a.

Milliampere-seconds

b.

Kilovoltage peak

c.

Distance

d.

Temperature

ANS:B

OBJ:Compare detector detective quantum efficiency to cassette-based systems.

TOP:DQE - detective quantum efficiency

20.The number and size of pixels available are determined by matrix size. This is known as the ______ factor.

a.

Fill

b.

Size

c.

TFT

d.

DQE

ANS:AOBJ:Explain the importance of detector size and orientation.

TOP:DQE - detective quantum efficiency

21.Detectors must be ______.

Copyright © 2008 by Mosby, Inc. an affiliate of Elsevier Inc.

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